Silver as a dopant and as a constituent in As-Ag-Te glasses: mean atomic volume and Tg

Mahadevan, Sudha and Giridhar, A (1996) Silver as a dopant and as a constituent in As-Ag-Te glasses: mean atomic volume and Tg. Journal of Non-Crystalline Solids, 197 (2amp;3). pp. 219-227.

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Abstract

The variations of the mean atomic volume, V, the glass transition temperature, Tg, and the activation energy for glass transition, Et, with composition have been reported for (As2Te3)1-xAgx and (As2Te3)-(Ag2Te) glasses; the glasses were prepared by a two-stage melt-quenching method. For the (As2Te3)1-xAgx glasses, changes in the nature of dependences of V, Tg and Et occur at the composition with Ag content of 1 atomic per cent (at.%). Analysis of these results indicates that, for Ag contents ? 1 at.%, Ag particles are uniformly dispersed in the network of the As2Te3 glass, without affecting either the short range or the medium range order of the parent glass. For Ag contents ? 3.5 at.%, Ag forms Ag-Te bonds, and the observed variation of the properties can be explained by assuming the resulting three component glasses to be homogeneous mixtures of (As2Te3) and (Ag2Te) units.